ExportDownloadsCsvTest.php

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<?php
namespace Magento\Reports\Test\Unit\Controller\Adminhtml\Report\Product;

use Magento\Reports\Controller\Adminhtml\Report\Product\ExportDownloadsCsv;

class ExportDownloadsCsvTest extends \Magento\Reports\Test\Unit\Controller\Adminhtml\Report\AbstractControllerTest
{
    protected $exportDownloadsCsv;

    protected $dateMock;

    protected function setUp()
    {
        parent::setUp();

        $this->dateMock = $this->getMockBuilder(\Magento\Framework\Stdlib\DateTime\Filter\Date::class)
            ->disableOriginalConstructor()
            ->getMock();

        $objectManager = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);
        $this->exportDownloadsCsv = $objectManager->getObject(
            \Magento\Reports\Controller\Adminhtml\Report\Product\ExportDownloadsCsv::class,
            [
                'context' => $this->contextMock,
                'fileFactory' => $this->fileFactoryMock,
                'dateFilter' => $this->dateMock,
            ]
        );
    }

    public function testExecute()
    {
        $content = ['export'];

        $this->abstractBlockMock
            ->expects($this->once())
            ->method('setSaveParametersInSession')
            ->willReturnSelf();

        $this->abstractBlockMock
            ->expects($this->once())
            ->method('getCsv')
            ->willReturn($content);

        $this->layoutMock
            ->expects($this->once())
            ->method('createBlock')
            ->with(\Magento\Reports\Block\Adminhtml\Product\Downloads\Grid::class)
            ->willReturn($this->abstractBlockMock);

        $this->fileFactoryMock
            ->expects($this->once())
            ->method('create')
            ->with('products_downloads.csv', $content);

        $this->exportDownloadsCsv->execute();
    }
}